Evaluation Board User Guide
UG-155
One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Evaluation Board for the AD5668 Octal, 16-Bit, Serial Voltage Output DAC
FEATURES
GENERAL DESCRIPTION
Full featured evaluation board for the AD5668
On-board reference
Various link options
PC control in conjunction with Analog Devices
System development platform (SDP)
PC software for control of DACs
On-board ADC for voltage readback
The Analog Devices, Inc., AD5668 evaluation board (EVALAD5668EBRZ and AD5668EBCZ) is designed to help
customers quickly prototype new AD5668 circuits and reduce
design time. The AD5668 operates from a single 2.7 V to 5.5 V
supply. The part incorporates an internal 1.25 V or 2.5 V onboard reference to give an output voltage span of 2.5 V or 5 V,
respectively. The on-board reference is off at power-up allowing
for the use of an external reference; the REF195 is used on this
evaluation board. The part must be written to after power-up to
turn on the internal reference.
PACKAGE CONTENTS
AD5668 evaluation board
AD5668 device
CD that includes
Self-installing software that allows users to control
the board and exercise all functions of the device
Electronic version of the AD5668 data sheet
Electronic version of UG-155
Consult the AD5668 data sheet, available from Analog Devices, in
conjunction with this user guide when using the evaluation board.
The evaluation board interfaces to the USB port of a PC via
the SDP board. Software is available with the evaluation board,
which allows the user to easily program the AD5668.
EXT REF IN/
INT REF OUT
5V VOLTAGE
REFERENCE
POWER SUPPLY INPUTS
EEPROM
SMB CONNECTORS
SDP
CONNNECTOR
VREFIN/VREFOUT
VOUTA
VOUTB
I/O
AD5668
ADG738
8:1 MUX
ADC
09114-001
VOUTH
Figure 1. Universal Evaluation Board
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
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Evaluation Board User Guide
TABLE OF CONTENTS
Features .............................................................................................. 1 Evaluation Board Software ...............................................................4 Package Contents .............................................................................. 1 Installing the Software ..................................................................4 General Description ......................................................................... 1 Running the Software ...................................................................4 Revision History ............................................................................... 2 Software Operation .......................................................................5 Evaluation Board Hardware ............................................................ 3 Evaluation Board Schematics and Artwork ...................................6 Power Supplies .............................................................................. 3 Bill of Materials ............................................................................... 10 Link Options ................................................................................. 3 REVISION HISTORY
6/10—Revision 0: Initial Version
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EVALUATION BOARD HARDWARE
POWER SUPPLIES
LINK OPTIONS
To power the AD5668 evaluation board, supply 5.5 V between
the AVDD and AGND inputs for the analog supply, and supply
5 V between DVDD and DGND inputs for the digital supply.
A number of link and switch options are incorporated in the
evaluation board and should be set for the required operating
setup before using the board. Table 2 describes the positions of
the different links to control the evaluation board by the PC, via
the USB port, using the AD5668 in single-supply mode. The
functions of these link options are described in detail in Table 3.
Both AGND and DGND inputs are provided on the board. The
AGND and DGND planes are connected at one location close
to the AD5668. It is recommended not to connect AGND and
DGND elsewhere in the system to avoid ground loop problems.
All supplies are decoupled to ground with 10 μF tantalum and
0.1 μF ceramic capacitors.
Table 1. Power Supply Connectors
Connector No.
J1
J2
Voltage
Analog positive supply and ground, AVDD and
AGND.
For single-supply operation, supply 5.5 V.
Digital positive power supply, DVDD.
For single-supply operation, supply 5 V.
Table 2. Link Options Setup for SDP Control (Default)
Link No.
LK1
LK2 to LK3
LK4
LK5
LK6
LK7
LK8
LK9 to LK14
Options
A
Inserted
Inserted
B
A
A
A
Inserted
Table 3. Link Functions
Link No.
LK1
LK2
LK3
LK4
LK5
LK6
LK7
LK8
LK9 to
LK14
Option
This link selects the AVDD power supply source for the analog circuitry:`
Position A selects J1 as the AVDD analog circuitry power supply source.
Position B selects the DVDD source as the AVDD analog circuitry power supply source (see LK6).
This link connects the VOUTG pin of the AD5668 to the input pin of the ADG738 demultiplexer, so that DAC output value can be
monitored using the on-board AD7476 ADC.
This link connects the VOUTH pin of the AD5668 to the input pin of the ADG738 demultiplexer, so that DAC output value can be
monitored using the on-board AD7476 ADC.
This link connects a 0.1 μF capacitor to AGND on the VREFIN/VREFOUT pin. It is recommended to connect this when using the
internal reference.
This link selects the reference source:
Position A selects the internal reference as the reference source. The part must be written to via software to turn on the internal
reference.
Position B selects the on-board 5 V reference as the reference source.
This link selects the 5 V power supply source for the digital circuitry:
Position A selects V_IO as the 5 V digital circuitry power supply source.
Position B selects J2 as the 5 V digital circuitry power supply source.
This link selects the DAC voltage source:
Position A selects the AVDD analog circuitry power supply source.
Position B selects the on-board 5 V reference as the power supply source.
This link sets the RESET pin on the ADG738:
Position A allows normal operation of the switch.
Position B resets the switch.
This link connects the VOUTA to VOUTF pins of the AD5668 to the input pins of ADG738 demultiplexer, so that the DAC output
value can be monitored using the on-board AD7476 ADC.
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EVALUATION BOARD SOFTWARE
INSTALLING THE SOFTWARE
The EVAL-AD5668EBZ evaluation kit includes self-installing
software on CD. The software is compatible with Windows® XP,
Windows Vista (32 bits), and Windows 7 (32 bits).
To obtain drivers for 64-bit operating systems, contact
Linear.Apps@analog.com.
1.
2.
3.
4.
Start the Windows operating system and insert the CD.
The installation software must open automatically. If it
does not, run the setup.exe file from the CD.
After installation is completed, power-up the evaluation
board as described in the Power Supplies section
Plug the EVAL-AD5668EBZ into the SDP board, and plug
the SDP board into the PC using the USB cable included
in the box.
When the software detects the evaluation board, proceed
through any dialog boxes that appear to finalize the
installation.
09114-002
Install the software before connecting the SDP board to the USB
port of the PC. This ensures that the SDP board is recognized
when it connects to the PC. Follow these steps:
Figure 2. Pop-Up Window Error
3.
Determine if the SDP board is connected to the boards.
If the SDP board is not connected to the evaluation boards,
a message box appears as shown in Figure 3. Check the
connection between the SDP and EVAL-AD5668EBZ
boards and run the program again.
RUNNING THE SOFTWARE
2.
Click Start > All Programs > Analog Devices > AD5668>
AD5668 Evaluation Software.
To uninstall the program, click Start > Control Panel >
Add or Remove Programs > AD5668 Evaluation
Software.
Determine if the SDP board is connected to the USB port.
If the SDP board is not connected to the USB port when
the software is launched, a connectivity error is displayed
(see Figure 2). Simply connect the evaluation board to the
USB port of the PC, wait a few seconds, click Rescan, and
follow the instructions.
Figure 3. Error Message
If the SDP board is connected, the System Development
Platform connects briefly.
09114-004
1.
09114-003
To run the program, do the following:
Figure 4. System Development Platform Wait Window
4.
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Notice that the main window of the AD5668 evaluation
software then displays, as shown in Figure 5.
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09114-005
Evaluation Board User Guide
Figure 5. AD5668 Evaluation Board Main Window
SOFTWARE OPERATION
3.
In the Data Bits section, enter the data in decimal format
in the Enter Value field. To execute, click Write to Part.
Note that you must click Write to Part to execute all writes
to the part.
4.
The voltage output on each DAC channel is monitored
using the on-board ADC. To read the output voltage, click
SAMPLE, in the ADC section (in the upper right of the
window).
5.
To set up the power-down DAC bits, the clear code register
bits, and the LDAC register bits, select the appropriate
option from the drop-down menu under Command Menu
and click Write to Part. You can also set the register bits
for the required mode of operation. Consult the AD5668
data sheet for details.
6.
To set LDAC and CLR to high or low, click the corresponding check box under Hardware Pins. Because this
command is executed immediately, there is no need to
click Write to Part.
Follow the steps below to operate the software:
1.
From the Analog Devices menu, click Start > All
Programs > Analog Devices >AD5668 > AD5668 SDP
Evaluation Software.
For older PCs, click Start > Programs > Analog Devices >
AD5668 >AD5668 SDP Evaluation Software.
The AD5668 main window opens, as shown in Figure 5.
The data programmed into the 32-bit input shift register
is displayed. You can select the command bits, the address
bits, and the data bits by clicking the appropriate button
under each area.
2.
To select a command to program the part, select the
appropriate option from the drop-down menu under
Command Menu. For example, to program all DAC
outputs with full scale , select Write to and Update DAC
channel n and then click All DACs under Address Bits.
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EVALUATION BOARD SCHEMATICS AND ARTWORK
09114-006
Figure 6. Schematic of AD5668 Evaluation Circuitry
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Figure 7. Schematic of SDP Connector
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Figure 8. Component Placement Drawing
Figure 9. Component Side PCB Drawing
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Figure 10. Solder Side PCB Drawing
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BILL OF MATERIALS
Table 4.
Qty.
1
1
1
9
3
6
1
1
2
3
1
2
13
9
4
1
2
1
1
1
Reference Designator
U8
U7
L1
LK2, LK3, LK4, LK9, LK10, LK11,
LK12, LK13, LK14
LK5, LK7, LK8
J4, J5, J6, J7, J8, J9
J3
U3
J1, J2
C2, C3, C9
C7
LK1, LK6
TP1 to TP12
C1, C4, C5, C6, C8, C10,
C19, C20, C21
R1, R2, R3, R4
R5
U4, U5
U1
U2
U6
Description
12-bit ADC
Matrix switch/multiplexer
Ferrite bead
Jumper block, 2-way, 2.54 mm pitch spacing
Supplier/Part Number
Analog Devices AD7476
Analog Devices ADG738
Digi-Key 490-1024-1-ND
FEC 1022247 and 150-411
Jumper block, 3-way, 2.54 mm pitch spacing
SMB jack 50 Ω
120-way female connector
32 kb I2C serial EEPROM
Terminal block, 2-way
Case A 10 μF capacitor
0603 10 μF capacitor
SIL header, 3-way
Red test point
0603 100 nF capacitor
FEC 1022248
FEC1206013
FEC 1324660
FEC 1331330
FEC 151789
FEC 197-130
FEC 318-8840
FEC 512-047 and 150-411
FEC 8731144 (pack)
FEC 8820023
SMD resistor
0603 1.5 Ω resistor, 5%, 0.063 W
Octal buffer/line driver
Octal 16-bit DAC with on-chip reference in LFCSP
Octal 16-bit DAC with on-chip reference in TSSOP
Low dropout voltage reference
FEC 933-0399
FEC 9331832
FEC 9591915
Analog Devices AD5668(CP)
Analog Devices AD5668(RU)
Analog Devices REF195
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NOTES
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Evaluation Board User Guide
NOTES
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions
set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you
have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc.
(“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal,
temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided
for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional
limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term
“Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including
ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may
not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to
promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any
occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board.
Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice
to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO
WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED
TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL
PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF
THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE
AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable
United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of
Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby
submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.
©2010 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
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